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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '382c2e3f80b7877bde97cac15fc6f442fcb79a405ab55f81c53b01440c6f45c9' 
  AND token = '/r1i0awlstC54tDr2jfP37WMbb8nOaP31Niv+gtApZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}